OK, efficiency for anything is power in divided by power out. Watt is the unit for power and for electricity, Watts = volts times amps. In the case of an appliance with a 15 amp max draw at 120 volts, the peak power required to operate it is going to be 15 x 120 or 1800 watts. Now that is PEAK draw, like when the A/C compressor first kicks on. Most of the time, it will draw less than 15 amps.
Back to efficiency....For that, we need a way to measure how much power output the device has. For that, we have another formula to find watts.... watts = force times distance divided by time. So if I'm running an electric winch to lift something, the power will be the weight of the load multiplied by how high it is lifted divided by how long it takes to lift it. No machine is 100% efficient as friction and heat will rob some of the power. Hope this helps
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Today's Featured Article - Show Coverage: The Old Gold National Antique Tractor Show - by Cindy Ladage. Over the fourth of July weekend, the Illinois State Fairgrounds in Springfield, Illinois, was the site of the Old Gold National Antique Tractor Show. Tractors of all makes and models were displayed and separted into categories by their age. Deere, Oliver and even a Wards and Keck Gonerman were part of the crowd. A sea of red International Harvester's seemed to be the the model with the biggest showing. The crowd was decent for the scorching July heat. The opening day started o
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